Diaphragm

Design

Requirements:

1. Shall connect soft goods to recovery assembly
2. Shall withstand separation loads
3. Shall withstand deployment loads

Material: Al 6061

Risks: Deforms during separation or parachute deployment

Features:

• Pie cuts for mass reduction
• Holes for interface with rope guide
• Hole through center for piston
• Radial holes for interface with cup
• Single hole on one of the spokes for anti-rotation rod

Booster Diaphragm:

Sustainer Diaphragm:

Analysis

Booster Diaphragm FEA: 

• lowest safety factor: 4.32

Sustainer Diaphragm FEA:

• lowest safety factor: 3.06
• fixture is center tapped hole
• force on lower lip: 360 lbf

Manufacturing

Operations:

1. Waterjet profile
2. Turn down diameter and step on lathe
3. Mill holes with radial indexer
4. Tap holes

Note: The CAD for the rope guide from McMaster is not exact- wait for the physical part to arrive and machine carefully